Synchronizing system



Sept. 19, 1933.

M. B. KERR 1,927,707 SYNCHRONIZING SYSTEM Filed Dec. 31, 1931 2Sheets-Sheet l.

EH9" I! II II II II "5 IV FIG. I

INVENTOR MARK B. KERR ATTORNEY Sept; 19, 1933.

M. B. KERR 1,927,707 SYNCHRONIZING SYSTEM Filed Dec. 31, 1931 2Sheets-Sheet 2 T IO Bum! II n u n h "mm P l l 1 FIG. 2

INVENTOR MARK B. KERR ATTORNEY Patented Sept. 19, 1933 ternational Yorkv Communications Y Laboratories, Inc., Newark, N. J.,

a corporation o .N iv.

' Application December 31, 1 931 Serial No. 584,121 7 9 Claims. (01.178- 53) My invention relatesto phase correction of two remotelydisposed rotating members, and more particularly to synchronoustelegraph or signalling systems. I

The object of my invention is to provide simple and .eflicient means'forkeeping the remotely disposed" members in phase with each other.Telegraph systems such as that herein illus- 4w trated and describedcomprise'rotating distributors remotelydisposed with respect to eachother and'connected by a signalling conductor in which is disposed apolarized relay responsive to signals Irom' the transmitting station.The signals transmitted are composed of' 'spacing or positive impulsesand marking or negative impulses.

The corrector mechanism comprises control relays initially controlled bythe operation of the polarized relay when responding to the transmittedimpulses. "These control relays are then controlled in sequence by camsassociated with the distributor mechanism.

'Ihe co-operation between the controlrelays and the'cams eliminates theso-called dead 25 spot so correctioncan take place at any period duringthe rotation of the distributor.

In adjusting the speed of a distributor with respect to the linesignals, it is the usual practice to listen to the operation'of thecorrector and count "the number of times the corrector magnet armatureoperates per minute, or" to introduce a visual indication of the magnetoperations.

I have arranged the circuit so that the corrector magnet is onlyenergized for a fractional part of the revolution of the distributor,and the armature..will operateas many times as-the starwheel on thedistributor is engaged with the correcting pin. There will thus be nodiffi- 4 culty in counting the number of correctionsf'per minute.

My invention is illustrated in the accompany- .drawings wherein: I f 1Fig. 1 shows .the apparatus and circuits of the .corrector; and" Fig. 2is a modification or Fig. 1.

Referring to Fig. l, a drive shaft for the distributor driven bymeans'not shown carries 250 .a ,fly wheel and a freely rotating brushcarrier 47. The brush carrier has a gear wheel 48 .Iormed integraltherewith, which meshes with a pinion 39 secured to a short shaft --40which is journalled in a control disc 41 -o'peratively 1. secured toshaft 45 by any suitable means,

such'as pin 42. The'other "endqof the 40 has a starwheel 46securedfthereto which is. prevented from rotating by a spring actuateddetent roller 49 carriedby control disc 41 The discs Cl and C2 aremounted upon shaft 435 my and rotate therewith tor controlling contacts112, 13 and 22, 23, respectively. I

A polarized line relay is shown at '2. The tongueiof relay 2 follows thereceived line sl g nals. When the tongue of relay 2"isrestin g m againstits spacing contact S, the condense -r3 willlbe discharged throughresistance4." ywhen a marking signal is received, the tongue relay 2will move over to themarkingcentafit M and the condenser -3wi-l;1.bechargedirom 7, battery 5. The charging current for condenser 3'" willflow through theywindings-otlooking relay 6. If the brush 7 isinpropenphaserelation with the received signals, then brush it will beon the 3 segments at the instan th 715 tongue of relay 2 arrivesat'its'marking contact, and the charging circuit of condenser '3 will asfollows: from battery 5, through condenser 3, marking contact-M, winding8 and winding- 9 of relays 6, segment B, brush' '-7, and thence 9through solid ring 10 to ground. It BhOlil-dfbfi noted'that the chargingimpulse goes through windings 8-and 9 in'series and that thesewindingsare connected in opposition. Since ings '8 and '9 have ,an''equa l number 01- turns, e5 it will be apparent"that the -armature -31-of relay 6 will not be -operated. The resistance of windings 8 and 9,howeven'limitsthe ccherg ing current' of condenser 3 and-therebyprovents damage to the contacts of relay 2 or distributor segments andbrushes.-- -When the. brush {7 is out of phase with the received signal,the brush-will be on theAisegment at the instant that the to'ngueofrelay 2 arrives at'its marking contact. 1 I l 05 The path ofthe-charging impulse '0! 4301166115! er '3 will .be. as follows: frombattery 5, th ough condenser 3; contact M, =-winding*8, segment A,brush- 7, solid ring 10, andthence to ground. Since-the chargingcurrent; in this case, passes through onlyzone winding-of locking-relay-45, the armature .31 will be attracted and the will lockup. I

When the need for correction occurs, Jock-mg relay 6 will lock itselfupthrough itsdocking winding 11, and a circuit to ground is pro videdintwo different ways. One is through contacts 22 and 23 controlled byam-02pm the other is through contactv 15 t'cngue116 p1 relay 17. Iflocking relay6 isg cked up; then 9 cam C1 closes its contacts .12 and13. When contacts 12 and 13 are closed, a circuit is completed from thetongue 31 of relay 6, which is now energized with positive battery, towinding of relay l'7,"to contacts 12 and 13, and thence .to ground.Armatures 16 and 21 of relay 17 will be operated and relay 17 will lockitself up through the following circuit: from tongue 16 to ground.Contacts 12 and 13 may 'now open, but relay 17 will remain energized.The

energization of relay 17, in turn, energized corrector magnet CM whichplaced'the pin 33 in the path of starwheel 46 and correction will takeplace. Shortly after this, camC2 will open contact 39,:correctingrelay1'7 will also bedeenergized and this relay in turn will deeenergizecorrector magent QM. The length of time dur-v ing which correctormagnetCM may be energized is the time elapsing' between the operation of=thecontactscontrolled by camsCl and C2. Double corrections cannot occur ifthe correcting impulses occur'after cam 01 is operated and before C2 isvoperated. At other points of the;revolution, however, .double correctionmay occur if .necessary.. V

Referriri'g .now,.to Fig.'2, relay 6 is operated as in. Fig.1, and isprovided with a locking'circuitextendingthrough contacts 22 and 23 of'not' be operated ;until cam 30,,tongue 31, winding of magnet CM,contacts r r V r v 4.5 contacts whichmust be'operatedto cause opercam C2andanotherlocking circuit extending through contact36 and tongue 3'7 toground. Tongue 37 is. operated by the armature25 of the corrector.magnet CM. Although locking relay 6 is operated, the corrector magnet GMwill V V I V i I 7 C 1 closes its contacts12 and 13. When these contactsare closed the corrector magnet CMwill be operated over thetollowingcircuit ground, battery, contact 12 and 13 to ground. I a r I,Thearmature; of the corrector magnet will now be operated and the.corrector magnet locked to ground through itswinding, tongue 37, contact3 8,;and contacts 12 and ,13. Pin 13 will then engage starwheel 46-andcorrection 1. In a telegraph system, the combination with a; rotarydistributor comprising fixed contact segments, rotating brushes and a.driving means for saidbrushes, of a differential relay operablewhencorrection is needed-a corrector 1 magnet conditioned for operationby operation of said relay, means i or operating. said conditionedmagnet to .alter the position :of said brushes with respect;to,said,driving means, means comprising,, cams ,driven. by. said driving meansfor limiting the period of operation of .saidicorrec- 'EOI'magnet toafraction, of .a revolution of said driving .means, and circuit meanscontrolled vloy ne3 of said .cams .forv causing de-energization e ate aa i In a, telegraph system, the. combination a tary distributorcomprising; fixed contact eg'ments r tsnng brushes and a driving whilethe corrector magnet is means for said brushes, of a corrector magnet,means for operating said magnet to alter the position of said brusheswithv respect to said driving means, a cam driven by said driving meansto determine the point in a revolution of said driving means .at whichsaid corrector magnet shall operate, and a second cam for deter: mininga point in the same revolution at which I said magnet shall be madeinoperative. 31, Winding of relay'1'7, contact 32 and tongue entiallyWound relay and a relay having a single its contacts 22 and 23 whichwill open the locking circuit of relay-6 which will be de-energized.

When the tongue 31 of relay 6 leaves its front winding for preparingsaid corrector magnet for operation, a cam for determining the instantof operation of said magnet in respect to said driving means cycle, andasecond cam for determining' the instant during the samej".revolution ofsaid driving means atwhich said magn'et shall be made inoperative.

4. In a synchronous telegraph system,v means for maintainingphas'elrelationship comprising. a rotary distributor having, contactbrushes and driving means therefor, means for alteringthe angular.relationship of said brushes with respect to said driving means, andmeansffor assuring that said altering means voperateduring" but a smallportion of a cycle of said drivingfineans, said last-mentioned meanscomprising a cam for making said altering means operative and a secondcam for subsequently making said alter ing means inoperative. s 5. In atelegraph system, the'combinatioriwith a rotary distributor comprisingfixed contact segments, rotating brushes and driving means for saidbrushes, of afcorrector magnet adapted when operated to cause alterationoffthe' poSiQ, tion of said brushes withrespect to. saiddriving means, acircuit controlling the' op,era'tion-of. said magnet and having at twopoints therein 6. In a telegraph system, the combination with adistributor comprising fixed contact segments,

rotating brushes and driving v means for said brushes, .a differentiallywound relay operable when correction is needed, a second relay preparedfor operation by operation of the differential relay, a cam fordetermining the instant'of operation of, said second relay in'resp ectto a cycle of said driving means, a corrector magnet operating inresponse tot-the operation of said 1' second relay to alter the positionof-said brushes with respect to said driving means, and a second cam'for determining the instant du'ringthe same revolution of said drivingmeans at which said relay and said magnet will be made inoperative. P iI 7 7. A- phase correction system for telegraph systems comprising 1 adistributor. having rotating brushes and a driving .meansxtherefo'na'differential relay operable: when correction. is needed, a correctormagnet conditioned for op- Ito eration by operation of said relay, camcontrolled means operable at a fixed point in a rotation of said drivingmeans to operate said magnet to effect correction of said brushes withrespect to said driving means, a second cam controlled means operable ata second fixed point in said distributor cycle to effect de-energizationof said corrector magnet, and circuit means efiective when said relayoperates in that portion of the distributor cycle lying between saidfirst and second cam controlled means to maintain said relay operateduntil the second operation of said second cam controlled means followingthe said operation of said relay.

8. A phase correction system according to claim 7 characterized by theprovision of circuit means for de-energizing said corrector magnet uponsaid second operation of said second cam controlled means. V

9. In a synchronous telegraph system, means for maintaining phaserelationship comprising a

